Keep in mind that so far, co2 levels have increased from below 300 to about 420 parts per million (alongside increases in other greenhouse gases). It's a stark

Keep in mind that so far, co2 levels have increased from below 300 to about 420 parts per million (alongside increases in other greenhouse gases). It's a stark difference that makes for a measurable increase in heat retention. The classic experiment is to fill one glass tube with atmospheric air and one with atmospheric air with added co2 and expose both to an infrared lighbulb and then take the temperature over time. Depending on the difference in concentration you can get a measurable temperature difference in hours. So it's really not a theoretical difference anymore that we need to speculate about, it's a tangible difference that we can measure with fairly basic instruments that you would find in a high school lab or even at home. Also, thanks to both of you for sharing.